Broan 511 Room-to-Room Wall Utility Fan, 8-Inch 180 CFM 4.5 Sones, White Square Plastic Grille N/A Imported 180 CFM 4.5 Sones Built-in variable speed control Housing adjusts to fit walls from 3-inch to 5-1/2-inch thick for easy interior wall installation Permanently lubricated motor High-strength, reinforced polymeric fan blade and two attractive white polymeric grilles can be painted to match dcor